The effects of predator removal on mallard production and population change in northeastern North Dakota

2012 ◽  
Vol 77 (1) ◽  
pp. 143-152 ◽  
Author(s):  
Courtney L. Amundson ◽  
Matthew R. Pieron ◽  
Todd W. Arnold ◽  
Laura A. Beaudoin
Keyword(s):  
North Dakota ◽  
Population Change ◽  
Predator Removal

scholarly journals Experimental manipulation of predation and food supply of arctic ground squirrels in the boreal forest

2000 ◽  
Vol 78 (8) ◽  
pp. 1309-1319 ◽  
Author(s):  
Andrea E Byrom ◽  
Tim J Karels ◽  
Charles J Krebs ◽  
Rudy Boonstra
Keyword(s):  
Boreal Forest ◽  
Ground Squirrel ◽  
Population Change ◽  
Ground Squirrels ◽  
Adult Survival ◽  
Food Supplementation ◽  
Snowshoe Hare ◽  
Arctic Ground Squirrel ◽  
Predator Removal ◽  
Arctic Ground Squirrels

We examined whether arctic ground squirrel (Spermophilus parryii plesius) populations in northern boreal forest in the Yukon Territory, Canada, were limited by food, predators, or a combination of both, during the decline and low phases of a snowshoe hare cycle. From 1990 to 1995, populations were monitored in large-scale (1 km2) experimental manipulations. Squirrels were studied on eight 9-ha grids: four unmanipulated control grids, two food-supplemented grids, a predator-exclosure grid, and a predator-exclosure + food-supplemented grid. Population density was measured on all grids by livetrapping and active-season survival was measured using radiotelemetry. Population densities were lowest in 1992 and 1993 (2 years after the snowshoe hare population decline). Rates of population change were negative from 1991 to 1993, when predation pressure was most intense after the snowshoe hare decline, and positive from 1993 to 1995, when hares and predators were at low densities. Predation accounted for 125 of 130 mortalities (96%) of radio-collared squirrels. Adult survival was significantly lower in 1992 and 1993 than in 1994 and 1995, and was a strong predictor of annual rates of population change in arctic ground squirrels. Treatments were ranked as follows in their effect on adult survival: predator exclosure + food-supplemented > food-supplemented > predator exclosure > controls. Juvenile survival was lowest in 1992, and food addition and predator removal separately increased juvenile survival. On average, predator exclusion increased population densities twofold, food supplementation increased densities fourfold, and food supplementation and predator removal together increased densities 10-fold. We conclude that food and predation interact to limit arctic ground squirrel populations in the boreal forest during the decline and low phases of the snowshoe hare cycle. The snowshoe hare cycle may indirectly create a lagged secondary fluctuation in arctic ground squirrel populations through shared cyclic predators.

Telepractice Brings Treatment to Rural North Dakota

ASHA Leader ◽  
2006 ◽  
Vol 11 (16) ◽  
pp. 16-17
Author(s):  
Bobbie Houn ◽  
Kolette Trottier
Keyword(s):  
North Dakota

Asthma Prevalence and Care for American Indian Youth in North Dakota

2003 ◽  
Author(s):  
Gregory Holzman ◽  
Kyle Muus ◽  
Barb Haugland ◽  
Marsha Blueshield ◽  
Cheryl Hefta ◽  
...  
Keyword(s):  
American Indian ◽  
North Dakota ◽  
Asthma Prevalence ◽  
American Indian Youth
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